quiz3 - 8. Frequency hopping requires multiple carrier...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1. A voice channel needs 4kHz. Using FDM, how many voice channels can be supported with 128 kHz? A. Up to 16 B. Up to 32 C. Up to 8 D. Up to 64 2. Suppose signal A and signal B are multiplexed using FDM, they are overlapped in the time domain. A. True B. False 3. Suppose signal A and signal B are multiplexed using TDM, they are overlapped in the time domain. A. True B. False 4. Suppose signal A and signal B are multiplexed using TDM, they could be overlapped in the frequency domain. A. True B. False 5. Statistical TDM does not allocate time slots periodically, while traditional TDM does. A. True B. False 6. Cable modems multiplex user signals using FDM A. True
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
B. False 7. The highest frequency of a voice channel is 4kHz. We multiplex 32 such voice signal using TDM. In order to do so, each signal must be converted from analog to digital. In the conversion, the sampling is lossless, the quantization uses 256 level. What is the total bit rate of the multiplexed TDM signal (in kbit/second)?
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 8. Frequency hopping requires multiple carrier frequencies. A. True B. False 9. DSSS spread the frequency of a signal BEFORE the modulation. A. True B. False 10. In CDMA, users' signals are overlapped in both time and frequency domain. A. True B. False 11. Framing means to identify the beginning and end of each frame from a bit stream. A. True B. False 12. HDLC framing is based on a special pattern "01111110", to make sure that this pattern does not appear in the data part of a frame (payload), what operation is needed? 13. Given a sequence 011111101111100, what is the result after bit stuffing? 14. Parity check can correct bit errors. A. True B. False 15. CRC can correct bit errors. A. True B. False 16. In CRC, if P(x)=x^5+x+1, then it must be able to detect single bit errors. A. True B. False 17. In CRC, if P(x) = x^3 + x +1, and the error pattern is 10110000, then the error can be detected. A. True B. False...
View Full Document

This note was uploaded on 12/10/2009 for the course ECE el6303 taught by Professor Moon during the Spring '09 term at NYU Poly.

Page1 / 3

quiz3 - 8. Frequency hopping requires multiple carrier...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online